A new approach to clock jitter simulation in digital control system
Long Quang Tran, Pj Radcliffe, Liuping Wang · 2017
Using current methods it is difficult to predict the effects of clock jitter on a real time control system. To be safe the designer will often choose an expensive high performance system where in fact a lower performance system with more jitter would be adequate. This paper proposes a new and novel technique to add realistic clock jitter to a MATLAB/Simulink based simulation of any real-time control system. This method is used to simulate a simple control system for speed control of a small DC motor and this is compared to the performance of a real system. Results show a close agreement between theory and the real system. It is further shown that considerable sampling jitter results in relatively small changes in performance for this system which suggests that a cheap controller with high jitter is quite adequate for the task. The pattern of jitter has been found to be important in affecting the response of the system. Most randomly chosen jitters have a small effect but particular patterns can have a much larger effect.